Benefits

The Lexium Stepper Drive (SD3) is a universally applicable stepper drive. Reference values are typically preset and monitored by a higher level PLC or a Motion Controller. A very compact and high-performance drive system has been created in combination with the 3-phase BRS stepper motors.

Click here to see some of our successful application examples.

Compactness

With its compact dimensions (H x W x D: 145 mm (5.7 in) x 72 mm (2.8 in) x 140 mm (5.5 in)) the SD3 stepper drive require little space in the control cabinet.

Simplicity

The simple cabling and parameterization of the SD3 26 makes it easy to commission quickly. Commissioning software is not required. The SD3 28 can be easily configured with the integrated control panel (HMI), via fieldbus or with the Lexium CT commissioning software.

Flexibility

SD3 is available in two power classes: 2.5 A and 6.8 A. Depending on the device type the SD3 includes the following components:

• an opto-isolated signal interface for 5-V and 24-V input signals (SD3 26 only)
• an RS 422 interface for pulse/direction signals or A/B encoder signals (SD3 28)
• a fieldbus interface for SD3 28•: CANopen and Modbus (SD3 28A) or Profibus (SD3 28B)
• analogue reference input ±10 V (SD3 28)
• a power supply unit for single-phase mains voltages of 115 VAC and 230 VAC
• integrated mains filter

The SD3 26 can optionally be delivered with an electronic system for rotation monitoring and brake control.

Application options

The SD3 stepper motor drive has very good synchronization characteristics, which are necessary for scanning or exposure, for example.  Due to the high torque at low speeds, the stepper motor drive is particularly suited for short-distance position movements.  Another advantage is its high holding torque at standstill. This allows automated tasks such as “pick and place” to be implemented very economically.

BRS stepper motors

Lexium BRS stepper motors are extremely robust, maintenance-free motors which carry out precise step-by-step movements controlled by Lexium Stepper Drives (SD3).  Maximum power can only be obtained if motor and electronics are perfectly tuned to each other.  These motors can be operated at a very high resolutions and options such as rotation monitoring and holding brake as well as robust, planetary gears with little backlash extend the application possibilities.

Special features:

• Quiet – as a result of the sine commutation and the special mechanical design of the motors, the BRS stepper motors are very quiet and run virtually without resonance.
• Strong – the optimized internal geometry of the motor ensures a high power density.
• Flexible - with the flexible modular system and modern variant management, a wide variety of motor type can be manufactured and delivered in a very short time.

Safety

The integrated “Safe Torque Off” (“Power Removal”) safety function enables a stop of category 0 and 1 as per IEC/EN 60204-1 without external power contactors.  This reduces the system cost and response time.  The drive system fulfills the requirements of IEC 61508 SIL2 as well as of ISO 13849-1 performance level “d” (PL “d”) and IEC/EN 61800-5-2 (“STO”).